Rail-vehicle bogie with depressed center pin



RAIL-VEHICLE BOGIE WITH DEPRESSED CENTER PIN Filed July 21, 1947 'Nov. 21, 1950 J. WALDVOGEL '2 Sheets-Sheet 1 1950 J. WALDVOGEL 2,530,495

RAIL-VEHICLE BOGIE WITH DEPRESSED CENTER PIN Filed July 21, 1947 2 Sheets-Sheet 2 Patented Nov. 21, 1950 RAIL-VEHICLE BOGIE WITH DEPRESSED CENTER PIN Jakob Waldvogel, Winterthur, Switzerland, as-

signor to Schweizerische Lokomotivund Maschinenfabrik, Winterthur, Switzerland Application July 21, 1947, Serial No. 762,229 In Switzerland February 11, 1943 Section 1, Public Law 690, August 8, 1946 Patent expires February 11, 1963 Claims.

1 My invention relates to a bogie for rail-vehicles, which is connected to the vehicle body by means of a depressed pin and a transom which is arranged below the bogie sills or passes therethrough, which transom is secured, on both sides and outside the bogie, to correspondingly de-- pressed body posts. In the inventive arrangement, the vehicle body further is supported on the bogie, at the ends of said transom, by means of a spring-supported laterally oscillatable bolster which rocks with the bogie.

In a known bogie structure of this kind, the bolster is pivoted on a pin to the transom which is fixed to the vehicle body. It is not intelligible, however, how the traction forces or brake forces are to be transmitted from the bolster onto the bogie frame, particularly when the bogie is swung about the vertical axis toward the vehicle body. In such known structure, in any case, the bolster is subjected to bending moments due to the transmission of the tractive force.

It is also known, in case of bogies provided with a bolster and for the purpose of directly transmitting the tractive or braking forces, to connect the vehicle body to the bogie frame by means of a pin fixed to the body and vertically and transversely displaceable relative to the bogie. Such pin, further, is connected to the bolster, which does not transmit any tractive forces, by a link which transmits only transverse forces. Such latter bogie construction, however, ofiers difficulties to the provision of a depressed pin, i. e. a pin disposed approximately at axle elevation, in that the structural design of the bogie frame is hindered by the vehicle-body cross-bracing which carries the pin and which has to be substantially depressed. When, viceversa, an excessively long pin is fixed to the vehicle body, such pin is excessively stressed, and it becomes very difficult to design the vehicle- 'body cross-bracing, to which the pin has to be fixed, sufiiciently strong.

My present invention permits of providing a depressed pin while avoiding a bolster subjected to bending stresses, in that the transom fixed to the vehicle body serves for directly transmitting tractive and braking forces from the bogie frame onto the vehicle body by means of a king pin which, in a manner known per se, is vertically and transversely displaceable, whereas the bolster, which is arranged underneath the said transom, is coupled to the latter by a separate auxiliary pin, arranged underneath the transom and constructed, as known per se, for resisting transverse forces only.

Several forms of the present invention are illustrated in the accompanying drawing, by way of example only, in which Fig. 1 shows a cross section of a bogie according to the present invention;

Fig. 1a is a cross-section on line Ia-Ia of Fig. 2.

Fig. 2 a staggered plan view;

Fig. 3 a side elevation of the central of the bogie,

Fig. 4 a fragmentary plan view of a modified king-pin guiding arrangement,

Fig. 5 a fragmentary plan view of a modified auxiliary-pin guiding arrangement,

Fig. 6 is a top plan view of the transom which is fixed to the vehicle body, and

Fig. 7 is a cross-section on the line VII-V II of Fig. 3, the springs being omitted.

The vehicle body I is provided with posts- 2 which extend down to a low level laterally of the bogie, and the lower ends of which are secured to a transom 3. The ends of the latter, and thus the vehicle body, are supported on a bolster structure by means of sliding shoes 4 which are adjustable by means of spherical socket joints 4a, the said bolster being resiliently and oscillatably suspended from the bogie frame 5. For this purpose, bolster beam 6, which is arranged underneath transom 3, is fixed to the buckles 1 of longitudinal plate springs 8, and the underside of the ends of transom 3 are provided with sufficientl large slide faces 9 for supporting the shoes 4.

The ends of springs 8 are suspended laterally oscillatable from bogie frame 5 by means of the swing links 10. As shown particularly in Fig. 1a, a pin 8' traverses each spring eye and a block l0 disposed between the ends of the springs B. A further pin Ill" disposed underneath the pin 8" at right angles thereto, passes through block [0. The two hanger rods ID are pivoted on pin II!" to block H) which is pivoted on pin 8' to the springs 8. Bolster beam 6 is held substantially parallel to the horizontal transverse axis of the bogie by means of links l2 which are arranged symmetrically to the longitudinal axis of the bogie. Links I2 are pivoted at one end (I3) to bolster beam 6, and at the other end to the lower end of the stays I4 which are fixed to the bogie frame 5. Such parallel arrangement also may be obtained by other means than those shown.

The bolster structure 4, M, 68, l3 and I6 shall, on one hand, partake of the lateral movements of the vehicle body and, on other hand, swing with the bogie. Bolster beam 6, therefore,

portion is coupled to transom 3 by an auxiliary pin l which is arranged underneath the latter and fixed thereto. Pin I5 is engaged in a longitudinal slot H of bolster beam B-by means of a link block 16 which is displaceable in the longitudinal direction of the vehicle. The longitudinal forces, due to such longitudinal playof block IS in slot [1 are not transmitted from the vehicle body to the bolster. Such transmission rather is effected through the king pin 20 which is fixed to the bogie frame 5 and, extending downwardly, is engaged, by means of a link block 2|, in the transverse slot 22 of transom 3. King pin 20 is restrained in the cross bracing 18 of bogie frame 5 over a comparatively great length.

The vehicle body, with respect to the bogie frame, may swing vertically up anddown and rock laterally, block H of king pin 20 freely moving in slot 22 of transom 3 laterally and vertically without impairing the transmission of the tractive force or braking force in the longitudinal direction. When the vehicle entersa'curve, the bolster structure and bogie rotate together, the lateral shoes 4 moving, relative to the vehicle body, on circular arcs about auxiliary pin [5 as center.

The inventive arrangement described affords a positive transmission of the tractive and braking forces respectively, from the bogie onto-the vehicle body without using a bolster subjected to :bending stresses. By subdividing the pin arrangement into a king pin and an auxiliary pin separate therefrom, one thereof transmitting only the longitudinal and the other only the transverse forces, the designer is given the necessary free hand of so arranging the "said 'pins as to reduce the strains and weights thereof.

The restraining of king pin 29 in the crossbrace-l8 of bogie -frame'5, in'particular, permits 20f fully utilizing the said brace I8. Due to king pin '20 extending downwardly and being engaged in transom 3 approximately at the la-tters crosssectional center of gravity, the desired pin depression and minimum stressing of transom 3 is attained. The stresses acting on transom 3 solely are defined by a bending moment acting in the horizontal plane thereof.

Instead of the slots 17 and 22, corresponding links may be provided for, as shown in plan in Figs. 4 and 5. In Fig. 4 king pin 20 is connected to transom '3 by a link 26. In Fig.5, auxiliary pin 15 is connected to bolster beam 6 by a link 21.

What I claim and desire to secure by Letters Patent is:

1. In a rail-vehicle bogie-frame, in combination with a vehicle-body including a transom having a depressed center portion, a bolster structure including at least one longitudinal spring on either side of the bogie frame, said springs having center buckles, and a bolster beam rigidl interconnecting the center buckles of the springs, a vertical auxiliary pin rigidly secured to the depressed transom center portion and secured in a universally tiltable and longitudinally displaceable relationship to the center portion of the bolster beam and substantially at the level thereof, body supporting means disposed between each center buckle of the said springs and the ends of the transom, a portion of said means moving, relative to the vehicle body, on circular arcs about the auxiliary pin as beam arising from traction forces is avoided, the

Vehicle body transom directly transmits the traction and braking forces from the bogie frame to the vehicle body through the king pin, and the auxiliary pin is used only for transmitting the transverse forces into the bolster.

2. A bogie frame setout in claim 1, comprising first slot-and-block means adapted to secure the auxiliar to pin to the bolsterbeam, and second slot-and-b'lock means adapted to secure the king pin to the transom, the slot of the first means being arranged transversely of the bolster beam,

and the slot of the second means being arranged lengthwise of the transom.

3. In a bogie frame set out in'claim 1, a swing link connecting the auxiliary pin to the bolster beam, said link at one end'being pivoted to the bolster beam at a'point situated in the longitudinaly axis thereof and at the other end "engaged by the auxiliarly pin.

4. In a bogie frame set out in claim 1, a swing link connecting the king pin to the vehicle-body transom, said link at one end being pivoted to the transom at a point situated in the longitudinal axis of the vehicle-body and at the other end engaged by the king pin.

5. A bogie set out in claim 1, in which the king pin at one end is secured to the bogie frame and, at the other end to the transom substantially at the level of the latter in a laterally and vertically movable relationship. 1

JAKOB WALDVOGEL.

REFERENCES CITED The following references are of record in the file of this patent:

FOREIGN PATENTS Number Country Date 618,745 Germany Sept. 14, 1936 812,534 France May 12, 1937 

